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I change my synthetics every 12-15k (usually depends if its a nice day out or if I have a big trip looming). I always change the fiter when I do this. I run alot of ethenol, so I sometimes change my filter (and top off) between oil changes. This may not be needed, but it makes me feel better and my oil comes out looking cleaner. My s10 burns about 1 qt every 8k or so, so I usually replace the filter when I do the top off.
Some guys give me flack for changing my oil so infrequently, and others say I'm wasting cash on the filter change (too frequently). I'm inclined to believe from what I've seen in my engines that I'm certainly doing them no harm with this formula. I really should have my oil alalyzed next time I change just to see if my present interval/oil filter swap is working effectively.
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